Variable governor limiting mechanism

Claim 1

A variable limiting mechanism in combination with a governor of an engine having an air inlet manifold, the governor including an axially movable control rod for adjusting at least one fuel pump and establishing a desired rate of fuel flow from the pump, the limiting mechanism including a housing arranged at one end of the control rod, a diaphragm member disposed for movement within the housing, a diaphragm member dividing the housing into first and second variable volume chambers, the first chamber being hermetically sealed and the second chamber being in communication with the air inlet manifold a link forming a slidable extension of the control rod, the link being secured for movement with the diaphragm member, the link including means for limiting motion of the control rod in one direction, said first chamber being formed by a pair of coaxially arranged bellows assemblies hermetically associated with the diaphragm member and housing, the link being coaxially arranged within an inner one of the bellows assemblies, and a spring arranged for interaction between the member and the housing, the spring tending to urge the member toward the other chamber, the spring having a strength suitable for establishing preselected positioning of the link and control rod limiting means relative to inlet manifold pressure in the other chamber.